Mouthpiece for whitening teeth



FIG. 1 is a front elevation view of the mouthpiece for whitening teeth, showing my novel design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a perspective view thereof. 

The ornamental design for a mouthpiece for whitening teeth, as shown and described. 